How many generations brother to sister; parent to offspring breedings must occur to be inbred? 15 10 20 5

The concept of inbreeding in genetics is a complex one and depends on various factors. It's not as simple as a set number of generations. Inbreeding refers to the mating of individuals who are related. The degree of inbreeding can vary widely, from close inbreeding (such as brother to sister) to more distant relatives.

In general, the more closely related the parents are, the higher the chance of their offspring being affected by inbreeding. This is because close relatives are more likely to carry the same harmful recessive genes, which can lead to health problems in their offspring when both parents pass these genes on.

However, it's important to note that not all offspring from inbred parents will be affected by health problems. The exact risk depends on how many harmful recessive genes the parents carry and whether these genes are passed on to their offspring.

In terms of a specific number of generations, it's not possible to give a definitive answer. The effects of inbreeding can become apparent after just one generation in some cases, while in others it may take several generations. It's also worth noting that inbreeding can lead to a decrease in genetic diversity, which can have long-term effects on a population's health and survival.